Response of native soil microbial functions to the controlled mycorrhization of an exotic tree legume Acacia holosericea in a Sahelian ecosystem

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Niveau: Supérieur, Doctorat, Bac+8
ORIGINAL PAPER Response of native soil microbial functions to the controlled mycorrhization of an exotic tree legume, Acacia holosericea in a Sahelian ecosystem Ablasse Bilgo & Sheikh K. Sangare & Jean Thioulouse & Yves Prin & Victor Hien & Antoine Galiana & Ezekeil Baudoin & Mohamed Hafidi & Amadou M. Bâ & Robin Duponnois Received: 5 March 2011 /Accepted: 15 May 2011 /Published online: 10 June 2011 _ Springer-Verlag 2011 Abstract Fifty years of overexploitation have disturbed most forests within Sahelian areas. Exotic fast growing trees (i.e., Australian Acacia species) have subsequently been introduced for soil improvement and fuelwood production purposes. Additionally, rhizobial or mycorrhizal symbioses have sometimes been favored by means of controlled inoculations to increase the performance of these exotic trees in such arid and semiarid zones. Large-scale anthropogenic introduction of exotic plants could also threaten the native biodiversity and ecosystem resilience. We carried out an experimental reforestation in Burkina Faso in order to study the effects of Acacia holosericea mycorrhizal inoculation on the soil nutrient content, microbial soil functionalities and mycorrhizal soil potential. Treatments consisted of uninoculated A. holosericea, preplanting fertilizer application and arbuscular mycorrhizal inoculation with Glomus intraradices. Our results showed that (i) arbuscular mycorrhizal (AM) inoculation and prefertilizer application significantly improved A. holosericea growth after 4 years of plantation and (ii) the introduction of A. holosericea trees significantly modified soil microbial functions.

  • acacia holosericea

  • soil microbial

  • has been

  • exotic tree

  • plants could

  • soil samples

  • significantly increased

  • soil mycorrhizal

  • australian acacia


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Mycorrhiza(2012)22:175187DOI10.1007/s00572-011-0390-2ORIGINALPAPERResponseofnativesoilmicrobialfunctionstothecontrolledmycorrhizationofanexotictreelegume,inaSahelianecosystemcAaAblasseBilgo&SheikhK.Sangare&JeanThioulouse&YvesPrin&VictorHienAntoineGaliana&EzekeilBaudoin&MohamedHafidi&AmadouM.BâRobinDuponnoisReceived:5March2011/Accepted:15May2011/Publishedonline:10June2011#Springer-Verlag2011AbstractFiftyyearsofoverexploitationhavedisturbedmostforestswithinSahelianareas.Exoticfastgrowingtrees(i.e.,AustralianAcaciaspecies)havesubsequentlybeenintroducedforsoilimprovementandfuelwoodproductionpurposes.Additionally,rhizobialormycorrhizalsymbioseshavesometimesbeenfavoredbymeansofcontrolledinoculationstoincreasetheperformanceoftheseexotictreesinsucharidandsemiaridzones.Large-scaleanthropogenicintroductionofexoticplantscouldalsothreatenthenativebiodiversityandecosystemresilience.WecarriedoutanexperimentalreforestationinBurkinaFasoinordertostudytheeffectsofAcaciaholosericeamycorrhizalinoculationonthesoilnutrientcontent,microbialsoilfunctionalitiesandmycorrhizalsoilpotential.A.Bilgo:S.K.Sangare:V.HienLaboratoireSol-Eau-Plante(SEP),InstitutdelEnvironnementetdeRecherchesAgricoles(INERA),01BP476Ouagadougou,BurkinaFasoJ.ThioulouseUMR5558,LaboratoiredeBiométrieetBiologieEvolutive,CentreNationaldelaRechercheScientifique(CNRS),UniversitéLyon1,69622Villeurbanne,FranceY.Prin:A.GalianaUMR113CIRAD/INRA/IRD/AGRO-M/UM2,LaboratoiredesSymbiosesTropicalesetméditerranéennes(LSTM),CampusInternationaldeBaillarguet,CentredeCoopérationInternationaleenrechercheagronomiquepourleDéveloppement(CIRAD),Montpellier,FranceE.Baudoin:A.M.Bâ:R.DuponnoisUMR113CIRAD/INRA/IRD/AGRO-M/UM2,LaboratoiredesSymbiosesTropicalesetméditerranéennes(LSTM),CampusInternationaldeBaillarguet,InstitutdeRecherchepourleDéveloppement(IRD),Montpellier,France&&icaoholesirecaTreatmentsconsistedofuninoculatedA.holosericea,preplantingfertilizerapplicationandarbuscularmycorrhizalinoculationwithGlomusintraradices.Ourresultsshowedthat(i)arbuscularmycorrhizal(AM)inoculationandprefertilizerapplicationsignificantlyimprovedA.holosericeagrowthafter4yearsofplantationand(ii)theintroductionofA.holosericeatreessignificantlymodifiedsoilmicrobialfunctions.Theresultsclearlyshowedthattheuseofexotictreelegumespeciesshouldbedirectlyresponsibleforimportantchangesinsoilmicrobiotawithgreatdisturbancesinessentialfunctionsdrivenbymicrobialcommunities(e.g.,catabolicdiversityandCcycling,phosphataseactivityandPavailability).TheyalsohighlightedtheimportanceofAMsymbiosisinthefunctioningofsoilsandforestplantationM.HafidiFacultédesSciencesSemlalia,LaboratoireEcologie&Environnement,UnitéassociéeauCNRST,URAC32,UniversitéCadiAyyad,Marrakech,MarocA.M.BâLaboratoireCommundeMicrobiologieIRD/ISRA/UCAD,InstitutdeRecherchepourleDéveloppement(IRD),CentredeRecherchedeBelAir,BP1386Dakar,SenegalPresentAddress:R.Duponnois(*)FacultédesSciencesSemlalia,LaboratoireEcologie&Environnement,UnitéassociéeauCNRST,URAC32,UniversitéCadiAyyad,Marrakech,Maroce-mail:Robin.Duponnois@ird.fr